Question

In a class test containing 30 questions (+5) marks are given for every correct answers and (-2) are given for every incorrect answer. Radhika attempts all the questions , but only 17 of her answers were correct. Find her total score

Answer 1

Answer:

Ncert solutions

Grade 7

Mathematics

Science

Chapters in NCERT Solutions - Mathematics, Class 7

Exercises in Integers

Question 6

Q6) In a class test (+ 3) marks are given for every correct answer and (–2) marks are given for every incorrect answer and no marks for not attempting any question. (i) Radhika scored 20 marks. If she has got 12 correct answers, how many questions has she attempted incorrectly? (ii) Mohini scores –5 marks in this test, though she has got 7 correct answers. How many questions has she attempted incorrectly?

Solution 6)

(i) In a class test,

marks given for every correct answer = 3

marks given for 12 correct answer = 12\times3\ =\ 3612×3 = 36

radhika obtained 20 marks in the class testt

therefore, marks obtained for incorrect answer = 20 -36

= -16

therefore, marks given for one incorrect answer = -2

so, no of incorrect answer = -16\times\frac{-1}{2}\ \ \ =\ 8\−16×

2

−1

= 8

Thus, radhika has attempted = 8 incorrect questions

(ii) Marks given for seven correct answer = 3\times7\ =21\3×7 =21

Mohini scores = -5

Marks obtained for incorrrect answer = -5-21 = -26

now, marks given for one incorrect answer = -2

therefore, no of incorrect answer Mohini has attempted = -26\times\frac{-1}{2}\ \ =13\ incorrect\ question−26×

2

−1

=13 incorrect question

Plz mark as brainlist

Answer 2

Answer:

59 marks

Step-by-step explanation:

See attached image…

Mark me the brainliest…